Mold ejecting mechanism for mold-forming machines



E. l. VALYl Feb. 23, 1954 MOLD EJECTING MECHANISM FOR MOLD-FORMINGMACHINES Filed June 20, 195' 9 Sheets-Sheet l men: in

Gitorneg E. I. VALYI Feb. 23, 1954 MOLD EJECTING MECHANISM FORMOLD-FORMING MACHINES 9 Sheets-Sheet 2 Filed June 20 1951 w 4 MA, I Y m5 (Ittorneg Feb. 23, 1954 E, VALY] 2,669,759

MOLD EJECTING MECHANISM FOR MOLD-FORMING MACHINES Filed June 20, 1951 9Sheets-Sheet 5 ZSnnemtor 51?) VAL Y/ 2 (Inc-meg Feb. 23, 1954 E7 vALY|2,669,759

MOLD EJECTING MECHANISM FOR MOLD-FORMING MACHINES Filed June 20, 1951 9Sheets-Sheet 4 67 I 3n'nentor .ewfleY W W ttorneg Feb. 23, 1954 E. l.VALYl 2,669,759

MOLD EJECTING MECHANISM FOR MOLD-FORMING MACHINES Filed June 20, i951 9Sheets-Sheet 5 lnvemorr lfffy 1444 Y/ ttorneg Feb. 23, 1954 E. l. VALYl2,669,759

MOLD EJECTINC MECHANISM FOR MOLD-FORMING MACHINES Filed June 20, 1951 9Sheets-5heet 6 lnventor Gttorneg E. l. VALYl Feb. 23, 1954 MOLD EJECTINGMECHANISM FOR MOLD-FORMING MACHINES MW \k IAN \v 9% 9 Sheets-Sheet 75/7519) 2'. l ALY/ Filed June 20, 1951 Gttorneg E. l. VALYI Feb. 23,1954 MOLD EJECTING MECHANISM FOR MOLD-FORMING MACHINES 9 Sheets-Sheet 8Filed June 20, 1951 M V i. M W 5 E. l. VALYI Feb. 23, 1954 MOLD EJECTINGMECHANISM FOR MOLD-FORMING MACHINES 9 Sheets-Shea:v 9

Filed June 20 1951 Zhwenfor inf/er Z VAL Y/ Gttorneg Patented Feb. 23,1954 MOLD. EJECTING MECHANISM. FOR, MOLD F-ORMING MACHINES Emery I.Valyi, Bronx, N. .Y.

AppIicationJimeZO 1951, S.erial.;N0-.2.3.2,505

7 Claims. (01. 2248) This. invention relates. generally to machines forproducing foundry'molds in shell formironr a molding mixture.comprisinga refractory and. a bonding. agent.

producing shell molds in machines". of this character anexcess quantityof the. moldingmixture. is. applied to l the face. of a. preheated metalpattern which is mounted in a suitable pattern" carrier; The mixtureis.held'in contact with the: pattern untiltlie contacting portion thereofbonds and solidifies.into.a.partially cured layer or'shell having: auniform thickness of, for example, between one-eighth. inch and.one-quarter. inch; The. thickness of. the shell depends on the timeofcontact. of. the. mixture andlthe temperature of. the pattern. Theunbondecl portion of. the mixture. isthenremovedi fromthe patternleavingthepartially. cured. shell. thereon. Theshell is; then. subjected to. acuring temperature of, for" examplahetween. 5009?. and 900? F. until theshell. is cured. to. a. hard. rigid; strong condition. Themold isthenstripped from the patternaiter whichthe pattern istreat'edjwith aparting solw tion and. the operation repeated. The: advancetreating 055-the pattern with a parting. solution prevents. the. shell. from adheringto the patternv so tightly thatitmight be broken during: stripping.

This. application. is-specifi'cally directed to the mechanism forstripping the cured. shells from the patterns and. removing the shellsfrom the; machine. The embodiment of' the invention shown and describedherein isespeciallyaclapted for; use. inthe. mold-forming machinedisclosed" inmyco-pending application Serial l lo..226,229;

the. stripping mechanism. The. pattern carrier" also. carries. anejector plate which is slidabl'y' mounted on a plurality of rods whichare secured to andextend downwardly, from the underside of thepatternicarrier. The ejector plate has securedthereto a plurality ofstripping pins which extend upwardly through apertures in the patternandterminateflush' with theface of the pattern. The number and thearrangement of thestripping pins isdependent upon the shape of thepattern and the mold formed thereon. In stripping a mold shell from apattern the ejector plate is engaged by suitable mechanism and movedtoward the carrier which projects the stripping pins-- out through theapertures in the pattern, thus stripping the shell from the pattern;

As shown herein the pattern; carrier and. the,

tit?

3 the. carriage.

2 pattern; with a cured" mold shell adhering to the face thereof, arepresented to the stripping mechanism in'inverted' position between theejector plate actuating; mechanism and, a. moldreceiving tray which isremovably secured inposition on a reciprocal. carriage; As-thepatterncarrier advances into stripping position .the" ejectorplate-actuating mechanism engages'opposita sides of the ejector plate;The plateeactuating mechanism remains inactive. until the receivingtrayhas been moved. upwardlyfromits carriage into. proximity with themold'shell, aftenwhichthe ejector plate andthe tray'are moved down"-wardly. in unison untiLthe. tray comes to rest. on

The ejector plate is then returned" to. its, original position whilethe" tray'with the: mold shell thereon remains. in itsoriginal positionon the carriage. The carriage is then" actuated'by suitable, mechanismto convey thettrayand shellthereon out of" the machine where the: mole.shell is removedirom' the tray, The; carriage with the tray thereon isthenpreturned'to'its original position after which. everythingis in".readiness for. thenext stripping operation.

The principal. object of" theinvention is to. provide in a. shellmold-forming machine improvedmechanism for stripping shellimolds frompatternsandconveying theshell'. molds from the: machine.

Another. object of, the. invention is to provide a mechanism of thischaracter which isv efficient in operation, is of.v relatively simpleconstruction, andwhich is..operative to successively strip mold shells:frompatterns presented thereto without" danger of. breaking the. shellsduring strippingand. discharge thereof. from the. machine.

Other.andllmorelimitedlobj ects oflthe invention will beapparentfromthefollowingspecification and. the. accompanying. drawings. forming a part"thereof wherein:

Fig. 1 is a. fragmentary longitudinal section.

Fig. 3 is a horizontal section taken on the line of Fig. 1;

Fig. 4 is an enlarged verticalsection taken on the line i t ofFig; 2;

Fig. 5 is a view similar to Fig. 4. showing: the mold-receiving trayraised? from its. carriage: into engagement: with a mold; shell;preparatory to stripping. the shell. from: itsv pattern Fig; 6.is an.enlarged: vertical section. taken. on I the: line 517-5. of. Fig. 2showing the: mold: shell stripped from the pattern onto the receivingtray with the various parts in the pos tion they assus e at the end ofthe stripping operation;

Fig. '7 is a fragmentary view similar to Fig. 6 showing the carriageconveying the tray and shell out of the machine;

Fig. 8 is an enlarged fragmentary horizontal section taken on the linesE-& of Figs. 2 and 9;

Fig. 9 is a vertical section taken on the line 9-9 of Fig. 8;

Fig. 10 is a detail section taken on the line ill-50 of Fig. 9; and

Fig. 11 is an enlarged detail section taken on the line ii-ii of Fig. 3.

Referring now to the drawings by reference characters, the numeral 3indicates the frame of a mold-forming machine, such as that shown and.described in my aforesaid co-pending application Serial No. 226,229,filed May 14, 1951.

The mold-forming machine includes a pair of spaced parallel chains 2which are arranged to be intermittently driven in the directionindicated by the arrows A around idler sprockets 3 which are rotatablymounted upon stub shaft t carried by the frame i.

A pattern-carrier 5 is secured to and between the chains 2 for movementtherewith. Each pattern-carrier 5 comprises a rectangular frame M havingan inturned annular flange it? around the lower edge thereof. pattern ld is removably secured within the frame i l upon the inturned flange 55by any suitable means, not shown. The frame l5 has a pair of shafthangers l1 formed integral therewith and extending downwardly therefrom,one at each side midway between the forward and rear ends thereof. Atransverse shaft id is rigidly secured in bores 59 in the hubs 22 of thehangers i? by pins 23. The shaft 58 is rotatably mounted in the hubs 2dof a pair of opposed trunnion links 25, one of which is interposed ineach of the chains 2 in place of one of the standard chain links. Arocker arm 26 is keyed to each end of the shaft I8 adjacent the trunnionlinks M. Each of the rocker arms 26 carries a pair of rollers 23, one ateach end thereof, which are adapted to ride on tracks 29 which aremounted upon the frame l along the outside of each of the chains 2. Eachend of the shaft is has an inwardly extending axial bore 32 therein inwhich A heavy thick metal 3% is slidably mounted a rod 33 which carriesa locking bar 34 at the inner end thereof. The locking bars 34 extendout through elongated slots at in the shaft if! and into opposed slots36 and 3? in the hanger hubs 22 and the trunnion-link the depth (frontto back) of the slots 36 in the hanger hubs 22 is at least equal to thewidth of the locking bars 3 5, and is substantially greater than thedepths of the slots 31 in the link hubs 24, so that the locking bars 34may be entirely 3 Withdrawn from the slots 3'! into the slots but cannotbe entirely withdrawn from the slots 36 into the slots 3?. Thus, whenthe locking bars 34 are disposed in both the slots 36 and 37 as shown inFigs. 8 and 9, the shaft :8 and the frame it carried thereby are lockedagainst rotary movement with respect to the trunnion links 25; and whenthe locking bars 345 are with drawn from the slots 3'! into the slots36, the shaft may be rotated in the trunnion links 25 by the rocker arms26 to shift the frame it from upright to inverted position, or viceversa, as and for the purpose hereinafter described. The rods 33 carrysmall rods 38 adjacent the outer to the shaft ill between the gears 65.

hubs 245, respectively. AS shown in Figs. 8 and 9, diameter of t gear 59is preferably about 8 from one at each corner thereof.

ends thereof which extend out through elongated vertically aligned slots42 and 43 in the shaft 18 and the rocker arms 28, respectively. A smallroller 44 is mounted on each end of the rods 3%. Springs d5 in the bores32 behind the rods 33 urge the rods 33 outwardly and the locking bars 34into locking position in the slots 3?. The locking bars 34 are movedinto the slots 36 out of locking position by moving the small rods 38and through them the rods 33 inwardly against the outward pressure ofthe springs 45.

A plurality of rods 46 having heads 41 on the lower ends thereof aresecured to the underside of the frame [4 and extend downwardly there- Anejector plate 48 is slidably mounted upon the rods 46. In normal uprightposition of the pattern carrier 5 the plate 48 rests upon the heads llof the rods at, and is yieldingly held thereagainst by balls 49, inhorizontal bores 52 in the plate 38, which are urged into engagementwith tapered notches es in the rods 46 by springs 54. Plates 55 carryinga plurality of stripping pins 5% are removably secured to the ejectorplate 48. The stripping pins 56 extend upwardly from the plates 55through bores 51 in the pattern l6 with the upper ends thereof normallyterminating flush with the upper surface of the pattern 16. The ejectorplate 48 has two spaced outwardly extending cylindrical bosses 58secured to each side thereof which are adapted to be engaged by theplateactuating mechanism to move the ejector plate.

toward the frame E4. The movement of the plate 48 projects the strippingpins 5's out through the bores 5i which'strips the mold shell 59 fromthe pattern as is explained in detail hereinafter.

The stripping mechanism comprises the ejector plate-actuating mechanismwhich is disposed above the conveyor chains 2 and a mold-receiving tray6! which is disposed below the chains 2. The tray M is removably securedin place on a discharge carriage 62 for movement therewith into and outof the molding machine.

The carriage t2 comprises a plate 553 which is secured to a pair ofspaced parallel elongated racks M which are supported by pinion gears 65at the forward ends thereof and by guides 66 spaced inwardly of themachine from the pinion gears 65. The pinion gears 55 are keyed to ashaft 61 which is rotatably mounted in suitable bearing blocks $8. Theguides 66 and the bearing blocks '58 are rigidly secured to the moldingmachine frame l. A pinion gear 69 having a much smal er pitch diameterthan the gear 65 is keyed The pitch of the rack ill rotates the shaft 5?and gears 65,

through the gear 58. The rotation of the gears 55 moves the racks lidand plate 63 carried thereby outwardly at approximately three times thespeed of movement of the rack it! due to the difference in the pitchdiameter of the gears 55 and 69. By this arrangement the carriage 52. is

moved a fixed distance by a much lesser movement of the rack ill.

When the rack it is moved in the opposite direction the carriage 62 isbrought back to its original position in the machine in the same manner.As the carriage or is moved outwardly from the machine the racks 6'14engage supporting guides- 72 secured to the frame I.

The tray Gt comprises a rectangular frame i and a mold' support To whichconforms to the contour of the pattern and mold shell and is removablysecured in the frame 15. It will be understood that when a differentpattern I5 is used a correspondingly different mold support 16 will beused. The" frame has a plurality of transversely extending angle ironsii secured to the underside thereof which seat upon the plate 63 of thecarriage 62. Certain of the angle irons H have blocks 18 rigidly securedto the sides thereof. 19 therein into which pins to secured to the plate63 extend when the tray 65! is in place on the carriage 62. It will beapparent that with this construction the tray 6i may be raisedvertically from the carriage 62, but cannot be shifted laterallythereon. The home It hasa longitudinally extending channel member tisecured to each side thereof.

The ejector plate-actuating mechanism til ismounted upon a platform 85carried bythe frame I above the conveyor chains 2 and comprises avertically reciprocal beam t6 which is adapted to be raised and loweredby a hydraulic cylinder and piston assembly 8? which is carried by theplatform 85 and isoperatively connected to the beam St at thegeometrical center thereof. pairs of rods 83 are rigidly secured to thebeam-lit; one pair adjacent each side thereof, and extend downwardlytherefrom through guide sleeves 39 carriedby the platform 215. Each.pair of rods 88' has an inwardly extending bracket LFl adjust ablysecured to the lower ends thereof. When the carriage 62, with tray iiithereon, is in its.

The blocks T8 have vertical apertures normal position within the machinethe inner edges of the brackets Eli are disposed in the grooves in thechannel members il-i' secured t'o the sides of the tray frame 551 Withthis construction it will be apparent that as the beam 86 is raised andlowered by the cylinderancl piston assembly tl thetray 6 I will beraised and lowered" in unison therewith.

Two pairs of rods 511 are slidably mounted for vertical reciprocation inguide sleeves 92" carried by the platform fits and vert'cally alignedsleeves 93 carried by the beam iiti longitudinally extending groove 95':in the inner face thereof is rigidly secured to the lower ends of eachpair of rods. Pneumatic cylinder and piston assemblies to which aresecured to the underside oi the" platform t5 and extend downwardlytherefrom are operatively connected to the bars Sitone assembly or beingconnected to each bar at. The cylinder and piston assemblies 8Bconstantly biasthe bars as and the rods 9 5 connected thereto to theiruppermost position. Latching means lilo is provided adjacent each pairof rods iii by which the rods 9% are lockedto the beam to for downwardmovement therewith. As a pattern-carrier 5 is moved into strip- A bar Mhaving a l the machine.

I03 which i's connected to and? between the arms. 10! slightly above aplane through the pivoted.

axis of the arms. The outward movement of the arms I01, under theinfluence of the spring? we; islimit'ed by adjustable stops HM, mountedinlug's I 05 onthebrackets H12, which are. engaged by fingers H16extending upwardly from the arms llll. Each arm Hli has a notch we hearthe lower end thereof which is adapted to en gage a roller i 38" carriedby the associated rod ill. thelower end thereofwhich is adapted toengage a stationary cam l Ill, mounted on thep1atform- 85, as the" beam86" approaches the lower" limit of its movement.

operations. patternscarrier' 5 with a cured shell mold 59 adhering tothe pattern llcarried thereby; is presented to th stripping anddischarge mechanism in inverted position as shown in Fig. i, with the5ton the sides of the: ejector plate engaging in the notches 95 of thebars 9 Pressure is then applied to the undersideoi the piston of thecylinder and piston assembly 3? which raises the beam tt fromthep'ositi'on shown in Fig. e to the position shown 5. As the beam 3'6moves upwardly it Ia aesthe tray ti from the carriage 62 up intoengagement with the mold. shell During the in .1 am movement of the beamto and tray 61 positic el'd thereby the pneumatic sense in the" der andpiston assemblies Atthe-upperlimit of movement of the beam f the arms ldiare swung outwardly by the ring ltthiifil the notche Itl'engage therollers rried by the rods El: which locks the bars" t l t tne'beam 3i)"fordownwardniovement therewith. Pressureis then applied to the upperside the piston ofthe cylinder and piston assem bljy M to move the beam86 downwardly against the constantly exerted upward pressure of thecylinder and piston assemblies 9%. As'the beam at ismoved downwardlyfrom the position shown iniliigi. 5 to the'position shown in Fig. 6?,thetray thusireei'ng therods il l and bars 95 from the The cylinder andpiston assemblies beam BE. 23 then return the rods 9 ,bars 9 's, ejectorplate 48; and stripping pins back to their original position shown; inFigs. l, 5 and 7, and the beams= 3t, rods: 88 andl brackets 30 remainin. their lowermost positions with the tray Bl, with: the. mcldi shell59? thereon, in position. on thecarriagot tit. and. the brackets: 96'engaging in the slots ini the channel.

55*. The meet tion shown? in. Figs;

members t l on the tray n'isrn is now the posi- 2 and 4' ready for thecarri'age to conv'er'hthe stripp'ed mold shell 59 from. Pressure is:then applied to the: cylinder and piston assembly Tl which actuatescarriage.asshotwnj in Figs. 3 and 'lto convey l with the mold shellthereon out the tray of the machine; tray t t is move-d 0ut-- wardly bythe: conveyor the channel members 81 ii out or with thebracket's $01Acter'the'mold shell tillhas been removed from th the pressure in-thecylinder and piston assembly ii is reversed which returns the carriageand tray back to their original position in Each arm Hll also carries aroller 10-9: at

the machine with the channel members @I again engaging the brackets 90.

The mechanism is now in condition for the next stripping operation.After the mold shell has been stripped from the pattern It onto the trayill and the ejector plate and the stripping ins have been returned totheir normal position, the pattern-carrier is moved away from strippingposition and returned to upright position in readiness for the formingof another mold shell.

From the fore-going it will be apparent to those skilled in this artthat I have provided a very simple and efiicient mechanism for strippingmold shells from the patterns on which they are formed and dischargingthem from the moldforming machine.

It is to be understood that I am not limited to the specificconstruction shown and described herein as modifications may be madetherein win. 1 the scope of the appended claims.

What claimed is:

1, A inecha r for stripping mold shells from patterns comp ng apattern-carrier having a pattern mounted thereon, an ejector plateslidably supported by pattern-carrier in spaced relation thereto, aplurality of stripping pins secured to said ejector plate and extendinginto apertures in said pattern and terminating flush with the face ofsaid pattern, vertically movable mold-receiving means below said patterncarrier, a reciprocal beam and means by which said beam is reciprocated,interconnecting means between said beam and said mole-receiving meansthrough which said mold-receiving means is moved ver ically toward andaway from said pattern oarrier by the reciprocation of said beam,ejector plate-gripping mechanism, releasable lat hing between said beamand said ejector plate-gripping mechanism through which saidgripping-mechanism is actuated by said beam to move ejector plate inunison with said receiving means in a direction to project saidstripping pins out through said apertures beyond the face of saidpattern for stripping a mold shell from said pattern onto saidmoldreceiving means while maintaining said mold re cciving means in moldsupporting position during 'ie stripping thereof from said pattern.

2. A mechanism for stripping mold shells from patterns comprising apattern-carrier having a pattern mounted thereon, an ejector plateslidably supported by said pattern-carrier in spaced relation thereto, aplurality of stripping pins secured to said ejector plate and extendinginto apertures in said pattern and terminating flush with the face ofsaid pattern, vertically movable moldn'eceiving means mounted below saidpattern, a platform disposed above said mold-receiving means, aplurality of rods slidably mounted in guides carried by said platform, abeam rigidly secured to the upper ends of said rods, a pair of spacedopposed brackets rigidly secured to the lower ends of said rods, meansslidably connecting said mold-receiving means to and between saidbrackets, means operative to move said pattern-carrier into strippingposition between said mold-receiving means and said platform, a secondset of rods slidably mounted in aligned guides carried by said platformand said beam, a pair of spaced opposed ejector plate-gripping meansrigidly secured to the lower ends of said second mentioned rods, meansyieldably holding said ejector plate-gripping means and the rods securedthereto in their normal up position, means operative to raise and lowersaid beam to move said mold-receiving means into and out ofmold-receiving position, and releasable latching means operative to locksaid second set of rodsto said means for downward movement therewith,whereby said mold-receiving means, said ejector plate and said strippingpins are all moved downwardly in unison thereby stripping a mold shellfrom said pattern onto said mold-receiving means.

3. A mechanism for stripping mold shells from patterns, as set forth inclaim 2, having means operative to move said mold-receiving means intoand out of engagement with said brackets.

4. A mechanism for stripping shell molds from patterns, as set forth inclaim 2, in which said releasable latching means comprises a pluralityof pivoted arms carried by said beam, engageable means carried. by eachof said second set of rods, means operative to move said arms intoengagement with said engageable means as said beam approaches the upperlimit of its movement, and means operative to move said arms out ofengagement with said engageable means as said beam approaches the lowerlimit of its movement.

5. A mechanism for stripping mold shells from patterns, as set forth inclaim 4, having means operative to move said mold-receiving means intoand out of engagement with said brackets.

6. A mechanism for stripping mold shells from. patterns, as set forth inclaim 1, in which said releasable latching mechanism comprises aplurality of pivoted arms, engageable means carried by said ejectorplate-gripping mechanism, means operative to move said arms intoengagement with said engageable means as said. beam approaches the limitof its movement in one direction, and means operative to move said armsout of engagement with said engageable means as said beam approaches thelimit of its movement in the other direction.

7. A mechanism for stripping'rnold shells from patterns comprising apattern-carrier having a pattern mounted thereon, an ejector plateslidably supported by said pattern-carrier in spaced relation thereto, aplurality of stripping pins secured to said ejector plate and extendinginto apertures in said pattern, a vertically movable mold receivingmeans below said pattern holder, means operative to move saidmold-receiving means upwardly substantially into contact with said moldshell on said pattern, and means operative to move said mold-receivingmeans and said ejector plate downwardly in unison in a direction toproject said stripping pins out through said apertures beyond the faceof said pattern for stripping a mold shell from said pattern onto saidmold-receiving means while maintaining said mold receiving means insupporting relationship to said mold shell.

EMERY I. VALYI.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,960,992 During et al. May 29, 1934 2,301,819 Sambrook Nov.10, 1942 2,425,362 Cherry et a1. Aug. 12, 1947

